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We are running 4" stealth wheels that are connected 1:1 onto mini cims. The only time we damaged the ball was when we were testing, and somebody forgot to reverse the left motor. This made both motors spin the same direction. It made two small gashes in the ball but it's still usable. We have another ball we bought, but we don't want to use it until we get the final version of our shooter made. Has anybody noticed a difference in performance in a wheeled shooter from a new ball compared to an old vall? And does anybody know how often they will switch balls out in the game?